ACS Applied Nano Materials
·
2021
·
IF 5.097
Meng Wu,Yipeng An,Ru Yang,Zhenhua Tao,Qixun Xia,Qianku Hu,Mian Li,Ke Chen,Zhanying Zhang,Qing Huang,Shu-hong Ma,Aiguo Zhou
In this paper, the performance and fundamental mechanisms on gas sensing of V2CTx and Ti3C2Tx MXenes were investigated. The MXenes nanosheets with the same chemical composition can show positive or negative response to the same gas due to the change of surface chemistry, which, in turn, is affected by the etching solution to make the samples. The residual Li or Na atoms on the surface of MXenes have a weak impact on the gas sensing performance; however, the ratio of Cl/F has a strong impact. V2CTx made in HF showed positive/zero response to the eight gases tested in this paper and had excellent sensing performance to methane. However, V2CTx made in LiF+HCl showed negative/zero response, while that made in NaF+HCl displayed positive response only to formaldehyde. Ti3C2Tx made in NaF+HCl showed a positive response to all detected gases while that made in ZnCl2 had better gas detection ability but showed a negative response to ammonia, triethylamine, and toluene. On the basis of the theoretical simulations, the structure-sensitive sensing behavior of MXenes as gas sensors is mainly ascribed to the structure-dependent electron transmission mechanism upon adsorbed gas molecule. This study is significant to the application of MXene sensors for designing specific gases.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 44
·23531-23541
·
IF 14.511
Fei Yu,Zhengqu Yang,Xiaochen Zhang,Peiyu Yang,Liqing Li,Jie Ma
MXenes have promising applications in capacitive deionization (CDI) due to their excellent electrical conductivity, tunable layer structure and hydrophilic surface. However, the electrochemical performance and water stability of MXenes would be limited by the large number of terminations on their surface. In this work, we obtained VS2/V2CTx nanocomposites by in situ partial derivatization of MXene to enhance electrochemical performance and slow down its own oxidation, and the resulting material was used as a cathode for CDI desalination. The TOPSIS-Entropy weight model was first used to achieve multi-objective optimization, realizing a salt adsorption capacity of 166.83 mg g−1, a salt removal rate of 3.67 mg g−1 min−1 and an energy consumption of only 0.256 kW h kg−1-NaCl. It also showed good stability over 60 CDI cycles. The fast salt removal rate and high desalination capacity of VS2/V2CTx can be explained by the synergy between the pseudocapacitive and battery behaviors of the VS2/V2CTx hybrid material. In situ electrochemical analysis based on electrochemical quartz crystal microbalance (EQCM) demonstrated that the desalination process is reversible and that the deionization mechanism is a combination of faradaic reaction (removal of Na+·4H2O) and intercalation pseudocapacitance (removal of desolvated Na+). This work shows that VS2/V2CTx, as a partially derived MXene material, provides a new solution to improve the stability and electrochemical properties of MXenes.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 47
·21895-21908
·
IF 3.5
Sun Chaohai,Yang Yang,Zhao Lu,Zhan Hao,Cheng Si
The efficiency of the electrocatalytic hydrogen evolution reaction (HER) is significantly advanced by developing proficient electrocatalysts. Herein, the novel carbonized spider silk nanofiber (SAC)/V 2 CT x heterostructured electrocatalysts (SAC/V 2 CT x ) are presented, which demonstrate robust stability and superior catalytic performance. The problem of nitrogen and sulfur loss due to high-temperature self-doping is resolved by the careful modulation of the KCl activation condition, which allows the thermal carbonization of spider silk at a lower temperature than in previous reports. This results in a porous structure, a high graphitization, and an adequate nitrogen/sulfur content. The deliberate intercalation of SAC with V 2 CT x creates a heterostructure that improves charge transfer, suppresses MXene’s tendency to stack, and significantly increases the stability and activity of the catalyst. The heteroatom doping, in synergy with the SAC/V 2 CT x heterostructure, results in a low charge transfer resistance of 31.2 Ω for SAC 1.2 /V 2 CT x under acidic conditions. It exhibits an overpotential of 164.3 mV at a current density of 10 mA cm −2 and a Tafel slope of 91.4 mV dec −1 . The catalyst maintains over 90% of its initial activity after 50 h of operation, highlighting its durability and suitability for sustainable HER processes.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Zhenxuan Zhao,Yu Gao,Shuangshuang Zhao
A soft actuator converts external energy sources like electricity, light, heat, and humidity into mechanical energy.These actuators are widely used in biomedicine, artificial muscles, electrical switches, and data encryption. MXenes, as two-dimensional materials, provide significant advantages, including high hydrophilicity and excellent photothermal and electrothermal conversion capabilities. However, research on MXene-based actuators has mainly focused on Ti 3 C 2 T x , leaving the potential of other MXene materials underexplored. This study developed V 2 CT x /PE film-based stimulus-responsive actuators using lamination and cutting techniques, considering the differing thermal expansion and hygroscopic properties of V 2 CT x and PE films, and examined their electrothermal and photothermal properties. Under a light power density of 70 mW/cm², the V 2 CT x /PE film actuator achieved a bending angle of 61°.The application of the V 2 CT x /PE actuator in smart curtains and crawling machines demonstrates the potential of stimulus-responsive MXene-based composite films for use in smart home technologies and robotics.
研究领域:
材料科学
·
生物医学工程
·
智能设备
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2020
·
IF 14.588
Xinliang Li,Mian Li,Qi Yang,Hongfei Li,Hailong Xu,Zhifang Chai,Ke Chen,Zhuoxin Liu,Zijie Tang,Longtao Ma,Zhaodong Huang,Binbin Dong,Xiaowei Yin,Qing Huang,Chunyi Zhi
Nonbattery behavior related phase transition of electrodes is usually not favorable for any batteries because it results in performance degradation at all times. Here, we demonstrate a zinc hybrid-ion battery (ZHIB) with an unusual capacity enhancement even within 18 000 cycles by employing V2CTX MXene as the cathode, enormously differing from all reported counterparts with capacity degradation initiated within hundreds of cycles. The dominated mechanisms are determined to be MXene delamination and an unexpected phase transition during cycling. Both the original cathode and secondary derivative contribute to capacity simultaneously, resulting in the unusual capacity enhancement. Consequently, the specific capacity of 508 mAh g–1 (highest for all reported aqueous zinc-ion batteries) and high energy density of 386.2 Wh kg–1 are realized. Also, the quasi-solid-state batteries fabricated can output stably at −20 °C and in bending, twisting, stabbing, and cutting conditions. Our work brings an effective approach, that is, utilizing “unstable” electrode materials, which should usually be avoided, to achieve continuously enhanced performance of a battery. The idea to use both original and secondary materials for energy storage may be developed to be a general method to achieve extraordinary cycling stability of batteries.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2024
·
IF 3.3
Chunxiao Wu,Sha Zhang,Jin Zhong Zhang,Yan Li
Water contamination from industrial activities has been a major problem throughout the world. Typically, lead ions (Pb2+) are recognized as a persistent contaminant posing a great threat to our environment and human health, which urgently needs to be solved. Adsorption is one of the most effective ways to solve it. MXenes show great potential for applications in the fields of adsorption due to their large specific surface area, excellent hydrophilicity, and structural stability. In this work, a series of V2CTx MXenes including multilayered V2CTx MXene (M-V2C), alkalized V2CTx MXene (A-V2C), and single-layer V2CTx MXene (S-V2C) were prepared by an etching method to apply for Pb2+ adsorption. Compared to M-V2C and A-V2C, S-V2C not only had the highest adsorption efficiency under the same conditions but also exhibited a wide pH adsorption ability in the range of 1–14, which cannot be achieved by other adsorbents. In addition, it showed great cycle performance after 10 cycles and selective adsorption of Pb2+ in the presence of other ions. Factors affecting the Pb2+ adsorption capacity of V2C and related mechanisms were also thoroughly investigated. This work demonstrates for the first time that S-V2C is a novel adsorbent material with excellent pH tolerance, regeneration performance, and selective adsorption ability, which shed bright light on the related applications.
研究领域:
环境科学
·
材料科学
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 25
·12705-12715
·
IF 11.301
Xinming Wu,Han Wang,Zhilin Zhao,Bin Huang
Although potassium-ion batteries have been widely studied because of their low cost and high theoretical capacity, the origin of the poor potassium-ion storage kinetics and low structural stability still remains elusive mainly due to the large size of K+ (0.138 nm). Herein, we report an interstratification-assembly strategy via van der Waals interactions to design a novel BPE@V2CTx hybrid anode, wherein black phosphorene (BPE) and V2CTx MXene are derived from their individual 2D nanosheets. The coupled BPE@V2CTx hybrid anode with a 2D stacked interstratification structure and large specific surface area could efficiently take advantage of BPE and V2CTx nanosheets and create more active sites. This interstratification hybrid electrode not only provides an enlarged interlayer spacing and a three-dimensional interconnected conductive network to accelerate the K+ transport rates, but also has good tolerance to volume changes caused by phase transformations during the fast potassiation/depotassiation process. DFT calculations further confirm that potassium affinities and diffusion kinetics are significantly enhanced in the BPE@V2CTx hybrid anode, particularly in BPE@V2CF2. As a result, the hybrid anode possesses a remarkable synergetic effect and achieves a high reversible capacity of 593.6 mA h g−1 at 0.1 A g−1 and excellent cycling stability of 485/261 mA h g−1 with 91/86% capacity retention after 3000 cycles at 0.2/2.0 A g−1. This work opens a new way for the application of self-assembled hybrid electrodes in energy storage, electrocatalysis and sensors.
研究领域:
材料科学
·
能源存储
·
计算化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Sairao Zhao,Xiao Luo,Yongfa Cheng,Zhixiang Shi,Tao Huang,Shanghua Yang,Haojian Zheng,Yun Bi,Jun Zhang,Qiuyue Shi,Minglei Cao,Chuankun Zhang,Yang Yue,Yanan Ma
Ti 3 C 2 T x MXene with unique physical and chemical properties are recently sparked tremendous interest in the energy storage field. Compared to Ti 3 C 2 T x , V 2 CT x MXene is a more promising candidate for energy storage due to a low number of atomic layers in the V 2 CT x structure and varied valence states of vanadium. Herein, we report a flexible V 2 CT x electrode with different layers (named accordion-like V 2 CT x , multi-layer V 2 CT x , and few-layer V 2 CT x, respectively) fabricated by using electrophoretic deposition, then assembled a flexible zinc ion hybrid capacitor (ZIHC) by virtue of zinc anode and gel electrolyte. The areal capacitance of few-layer V 2 CT x based ZIHC is 54.12 mF cm −2 at 0.1 mA cm −2 , which is greater than those of accordion-like V 2 CT x and multi-layer V 2 CT x based ZIHC. The outstanding electrochemical performance of few-layer V 2 CT x based ZIHC is attributed to its richer active sites and shorter ion transport routes. Additionally, the few-layer V 2 CT x based ZIHC also owns well cycling stability, with 81.48 % capacity retention after 8000 cycles, and a low self-discharge rate of 6.4 mV h −1 , making it suitable for wearable devices. So, the V 2 CT x based ZIHC is integrated with a Ti 3 C 2 T x based pressure sensor to monitor diverse human activities, demonstrating its steady and long-term power supply capacity as the energy storage device.
研究领域:
材料科学
·
能源存储
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Han Wang,Bingzhe Jia,Zhilin Zhao,Chunyan Luo,Xinming Wu
Two-dimensional (2D) materials used in potassium ion batteries (PIBs) have high theoretical capacitance and excellent rate characteristics. However, the origin of low diffusion of potassium ions and poor storage kinetics still remain challenge mainly due to the large size of potassium ions (0.138 nm) and narrow 2D interlayer spacing. Herein, the V 2 CT x -based hybrids including 1T-MoS 2 (1T -MoS 2 @V 2 CT x ) has been successfully constructed by the magneto-hydrothermal method and proved to be an eminent anode, which can make PIBs have high reversible capacity and eminent rate performance at the same time. Moreover, the combination of 2D 1T-MoS 2 and V 2 CT x not only significantly promotes the transfer of interfacial charges as well as accelerates the transmission and diffusion of electrons and K + , but also helps to alleviate the volume changes caused by the insertion/extraction of large-sized K + during the cycle, which makes the electrode exhibit good cycle stability. Density functional theory (DFT) indicates that the synergy effect between 1T-MoS 2 and V 2 CT x has significantly strengthened the potassium affinities and ion diffusion kinetics in the 1T-MoS 2 @V 2 CT x anode by reducing the ion diffusion energy barrier, thereby showing outstanding K + storage performance, especially in 1T-MoS 2 @V 2 CF 2 . As a result, the 1T-MoS 2 @V 2 CT x anode shows a high reversible capacity of 887.3 mA h g −1 at 0.1 A g −1 , eminent rate performance of the capacity maintaining 563.6 mA h g −1 at 2.0 A g −1 and remarkable cycle stability of 601.2/374.7 mA h g −1 with 69.4/56.5% capacity retention after 2000 cycles at 1.0/2.0 A g −1 . This work provides a new way for the exquisite design of 2D composite electrodes with excellent performance in PIBs.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2025
·
IF 1.7
Wang Yunqian,Shi Haixiang,Chen Liuyun,Su Tongming,Luo Xuan,Xie Xinling,Ji Hongbing,Qin Zuzeng
NiIn intermetallic compounds are constructed over V 2 CT x MXene for the selective hydrogenation of cinnamaldehyde (CAL) to cinnamyl alcohol (COL). Ni 4 In/V 2 CT x demonstrated a conversion rate of 93.6% for CAL, with a high selectivity of 77.4% for COL. The COL yield of Ni 4 In/V 2 CT x is much greater than that of Ni 4 In, Ni/V 2 CT x , and Ni 4 In/Al 2 O 3 . Moreover, the V 2 CT x support is the key to the formation of NiIn intermetallic compounds, which effectively inhibit the oxidation of metallic Ni. NiIn metal particles are uniformly distributed on the surface of V 2 CT x , increasing the metal‒support interaction. Electron-deficient metallic Ni and In inhibit the hydrogenation of the C=C bond. Furthermore, the introduction of In provides more abundant and stronger Lewis acid sites, facilitating the adsorption of C=O bonds and thereby enhancing the selectivity for COL.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2024
·
IF 5.2
Jiucong Liu,Mengdi Zhang,Di Zhang,Xizheng Liu
Lithium-ion batteries (LIBs) suffered from severe performance fading when operated at lower temperatures due to the increase of Li desolvation energy and the formation of Li dendrites on the anode surface. It is critically important to develop a suitable anode with higher capacity retention at lower temperatures for advanced LIBs. Herein, we report the fabrication of a composite anode by confining room-temperature liquid GaInSn alloys within a porous 2D-layered V2CTx MXene. This configuration combines the high capacity of liquid metal (LM) and high ionic conductivity of 2D V2CTx by confining self-healing LM within the V2CTx framework, resulting in enhanced long-term cycle performance (1174.6 mA h g–1 after 200 cycles at 200 mA g–1) and low-temperature performance (529.6 mA h g–1 after 100 cycles at −20 °C). Theoretical calculations disclose that the strong adsorption of V2CTx to LM ensures the stability of the composites. It also reveals that LM with a lower adsorption energy promotes the transportation of Li+. The LM nanodroplets buffer the volume change of V2CTx during charging/discharging and avoid electrode crushing. The expanded layers of V2CTx and the porous structure facilitate the Li-ion desolvation and transportation at lower temperatures, thus suppressing the performance fading. This work paves the way for the development of composite anodes for LIBs with high specific capacity toward low-temperature applications.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
ELECTROCHEMISTRY COMMUNICATIONS
·
2024
·
IF 4.7
Jinru Wen,Hongyan Dan,Chunyang Li,Chunlong Dai,Zifeng Lin
The development of MXenes using Lewis acidic salts for etching (MS-MXenes) in molten salts presents a novel, fluorine-free method attracting considerable interest. However, the behavior of various MS-MXenes and their derivatives in aqueous environments remains largely unexplored. Particularly, vanadium-based MXenes demonstrate intriguing properties in Zn ion aqueous electrolytes. Herein, a fluorine-free V 2 CT x MXene@VO x is synthesized by molten salt etching under an argon atmosphere. The electrochemical properties of V 2 CT x @VO x are tested in various aqueous electrolytes, including Zn(TFSI) 2 , ZnSO 4 , ZnBr 2 , ZnAc 2 , and ZnCl 2 solutions. The V 2 CT x @VO x shows high redox capacities in all these Zn ion electrolytes, with the peak performance observed in 1 M ZnBr 2 , achieving a maximum capacity of 172 mAh g −1 at 1 mV s −1 . This performance rivals that of V 2 CT x MXene prepared through wet-chemical methods. These results underscore the potential of MS-MXenes materials in aqueous energy storage applications.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）